Chemistry

In the electrolytic reduction of pure alumina to pure aluminium by Hall Herault's process, give the electrolytic reactions involved in the same, resulting in formation of aluminium at the cathode.

Metallurgy

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Answer

In the electrolytic reduction of pure alumina to pure aluminium by Hall Herault's process, the constitutents of electrolyte are cryolite (Na₃AlF₆) and fluorspar (CaF₂) and alumina (Al₂O₃)

The electrolytic reactions are as follows :

Cryolite : Na₃AlF₆ ⇌ 3Na¹⁺ + Al³⁺ + 6F^1-

Fluorspar : CaF₂ ⇌ Ca²⁺ + 2F^1-

Alumina : Al₂O₃ ⇌ 2Al³⁺ + 3O^2-

At cathode : 2Al³⁺ + 6e^- ⟶ 2Al

At anode : 3O^2- - 6e^- ⟶ 3[O] ⟶ 3O₂

Al³⁺ are discharged in preference to Na¹⁺ and Ca²⁺ ions due to it's lower position in the electrochemical series.

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Chemistry

In the electrolytic reduction of pure alumina to pure aluminium by Hall Herault's process, give the electrolytic reactions involved in the same, resulting in formation of aluminium at the cathode.

Metallurgy

Answer

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Chemistry

In the electrolytic reduction of pure alumina to pure aluminium by Hall Herault's process, give the electrolytic reactions involved in the same, resulting in formation of aluminium at the cathode.

Metallurgy

Answer

Related Questions

Give reasons for the following:Coke is not preferred as a reducing agent in the reduction of the oxide of mercury to it's metal, but is preferred in the reduction of the oxide of zinc to it's metal.

In the extraction of aluminium from bauxite, the first step is the dressing of the ore by Baeyer's process. Give balanced equations for the conversion of impure bauxite to pure alumina using a concentrated solution of NaOH.

State the function of (i) Sodium hydroxide (ii) Cryolite (iii) Fluorspar in the metallurgy of aluminium in Hall Herault's process.

Give reasons for the following:
Coke is not preferred as a reducing agent in the reduction of the oxide of mercury to it's metal, but is preferred in the reduction of the oxide of zinc to it's metal.